Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation
Abstract
It has been widely observed around the world that the frequency and intensity of new particle formation (NPF) events are reduced during periods of high relative humidity (RH). The current study focuses on how RH affects the formation of highly oxidized molecules (HOMs), which are key components of NPF and initial growth caused by oxidized organics. The ozonolysis of α-pinene, limonene, and Δ3-carene, with and without OH scavengers, were carried out under low NOx conditions under a range of RH (from ~3% to ~92%) in a temperature-controlled flow tube to generate secondary organic aerosol (SOA). A Scanning Mobility Particle Sizer (SMPS) was used to measure the size distribution of generated particles, and a novel transverse ionization chemical ionization inlet with a high-resolution time-of-fight mass spectrometer detected HOMs. A major finding from this work is that neither the detected HOMs nor their abundance changed significantly with RH, which indicates that the detected HOMs must be formed from water-independent pathways. In fact, the distinguished OH- and O3-derived peroxy radicals (RO2), HOM monomers, and HOM dimers could mostly be explained by the autoxidation of RO2 followed by bimolecular reactions with other RO2 or hydroperoxy radicals (HO2), rather than from a water-influenced pathway likemore »
- Authors:
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1493639
- Alternate Identifier(s):
- OSTI ID: 1613057
- Grant/Contract Number:
- SC0014469; SC0019000
- Resource Type:
- Published Article
- Journal Name:
- Atmospheric Chemistry and Physics (Online)
- Additional Journal Information:
- Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 19 Journal Issue: 3; Journal ID: ISSN 1680-7324
- Publisher:
- Copernicus Publications, EGU
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
Citation Formats
Li, Xiaoxiao, Chee, Sabrina, Hao, Jiming, Abbatt, Jonathan P. D., Jiang, Jingkun, and Smith, James N. Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation. Germany: N. p., 2019.
Web. doi:10.5194/acp-19-1555-2019.
Li, Xiaoxiao, Chee, Sabrina, Hao, Jiming, Abbatt, Jonathan P. D., Jiang, Jingkun, & Smith, James N. Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation. Germany. https://doi.org/10.5194/acp-19-1555-2019
Li, Xiaoxiao, Chee, Sabrina, Hao, Jiming, Abbatt, Jonathan P. D., Jiang, Jingkun, and Smith, James N. Wed .
"Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation". Germany. https://doi.org/10.5194/acp-19-1555-2019.
@article{osti_1493639,
title = {Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation},
author = {Li, Xiaoxiao and Chee, Sabrina and Hao, Jiming and Abbatt, Jonathan P. D. and Jiang, Jingkun and Smith, James N.},
abstractNote = {It has been widely observed around the world that the frequency and intensity of new particle formation (NPF) events are reduced during periods of high relative humidity (RH). The current study focuses on how RH affects the formation of highly oxidized molecules (HOMs), which are key components of NPF and initial growth caused by oxidized organics. The ozonolysis of α-pinene, limonene, and Δ3-carene, with and without OH scavengers, were carried out under low NOx conditions under a range of RH (from ~3% to ~92%) in a temperature-controlled flow tube to generate secondary organic aerosol (SOA). A Scanning Mobility Particle Sizer (SMPS) was used to measure the size distribution of generated particles, and a novel transverse ionization chemical ionization inlet with a high-resolution time-of-fight mass spectrometer detected HOMs. A major finding from this work is that neither the detected HOMs nor their abundance changed significantly with RH, which indicates that the detected HOMs must be formed from water-independent pathways. In fact, the distinguished OH- and O3-derived peroxy radicals (RO2), HOM monomers, and HOM dimers could mostly be explained by the autoxidation of RO2 followed by bimolecular reactions with other RO2 or hydroperoxy radicals (HO2), rather than from a water-influenced pathway like through the formation of a stabilized Criegee intermediate (sCI). However, as RH increased from ~3% to ~92%, the total SOA number concentrations decreased by a factor of 2–3 while SOA mass concentrations remained relatively constant. These observations show that, while high RH appears to inhibit NPF as evident by the decreasing number concentration, this reduction is not caused by a decrease in RO2-derived HOM formation. Possible explanations for these phenomena were discussed.},
doi = {10.5194/acp-19-1555-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 3,
volume = 19,
place = {Germany},
year = {Wed Feb 06 00:00:00 EST 2019},
month = {Wed Feb 06 00:00:00 EST 2019}
}
https://doi.org/10.5194/acp-19-1555-2019
Web of Science
Works referenced in this record:
New particle formation during <font face="Symbol" >a</font>- and <font face="Symbol" >b</font>-pinene oxidation by O<sub>3</sub>, OH and NO<sub>3</sub>, and the influence of water vapour: particle size distribution studies
journal, January 2002
- Bonn, B.; Moorgat, G. K.
- Atmospheric Chemistry and Physics, Vol. 2, Issue 3
Evidence for the role of organics in aerosol particle formation under atmospheric conditions
journal, January 2010
- Metzger, A.; Verheggen, B.; Dommen, J.
- Proceedings of the National Academy of Sciences, Vol. 107, Issue 15
Chemistry of Atmospheric Nucleation: On the Recent Advances on Precursor Characterization and Atmospheric Cluster Composition in Connection with Atmospheric New Particle Formation
journal, April 2014
- Kulmala, M.; Petäjä, T.; Ehn, M.
- Annual Review of Physical Chemistry, Vol. 65, Issue 1
Acid-base chemical reaction model for nucleation rates in the polluted atmospheric boundary layer
journal, October 2012
- Chen, M.; Titcombe, M.; Jiang, J.
- Proceedings of the National Academy of Sciences, Vol. 109, Issue 46
Nucleation and Growth of Nanoparticles in the Atmosphere
journal, November 2011
- Zhang, Renyi; Khalizov, Alexei; Wang, Lin
- Chemical Reviews, Vol. 112, Issue 3
Impact of nucleation on global CCN
journal, January 2009
- Merikanto, J.; Spracklen, D. V.; Mann, G. W.
- Atmospheric Chemistry and Physics, Vol. 9, Issue 21
Computational Study of Hydrogen Shifts and Ring-Opening Mechanisms in α-Pinene Ozonolysis Products
journal, November 2015
- Kurtén, Theo; Rissanen, Matti P.; Mackeprang, Kasper
- The Journal of Physical Chemistry A, Vol. 119, Issue 46
SIMPOL.1: a simple group contribution method for predicting vapor pressures and enthalpies of vaporization of multifunctional organic compounds
journal, January 2008
- Pankow, J. F.; Asher, W. E.
- Atmospheric Chemistry and Physics, Vol. 8, Issue 10
A look at aerosol formation using data mining techniques
journal, January 2005
- Hyvönen, S.; Junninen, H.; Laakso, L.
- Atmospheric Chemistry and Physics, Vol. 5, Issue 12
Chemical evolution of atmospheric organic carbon over multiple generations of oxidation
journal, February 2018
- Isaacman-VanWertz, Gabriel; Massoli, Paola; O’Brien, Rachel
- Nature Chemistry, Vol. 10, Issue 4
Dependence of particle nucleation and growth on high-molecular-weight gas-phase products during ozonolysis of α-pinene
journal, January 2013
- Zhao, J.; Ortega, J.; Chen, M.
- Atmospheric Chemistry and Physics, Vol. 13, Issue 15
Influence of Water Vapor on the Process of New Particle Formation during Monoterpene Ozonolysis
journal, March 2002
- Bonn, Boris; Schuster, Gerhard; Moortgat, Geert K.
- The Journal of Physical Chemistry A, Vol. 106, Issue 12
Turbulent deposition and gravitational sedimentation of an aerosol in a vessel of arbitrary shape
journal, January 1981
- Crump, James G.; Seinfeld, John H.
- Journal of Aerosol Science, Vol. 12, Issue 5
Formation and evolution of molecular products in α-pinene secondary organic aerosol
journal, November 2015
- Zhang, Xuan; McVay, Renee C.; Huang, Dan D.
- Proceedings of the National Academy of Sciences, Vol. 112, Issue 46
How do organic vapors contribute to new-particle formation?
journal, January 2013
- Donahue, Neil M.; Ortega, Ismael K.; Chuang, Wayne
- Faraday Discussions, Vol. 165
Aerosol Formation from the Reaction of α-Pinene and Ozone Using a Gas-Phase Kinetics-Aerosol Partitioning Model
journal, May 1999
- Kamens, Richard; Jang, Myoseon; Chien, Chao-Jung
- Environmental Science & Technology, Vol. 33, Issue 9
New particle formation in the free troposphere: A question of chemistry and timing
journal, May 2016
- Bianchi, F.; Trostl, J.; Junninen, H.
- Science, Vol. 352, Issue 6289
Impact of Humidity on the Ozone Initiated Oxidation of Limonene, Δ 3 -Carene, and α-Pinene
journal, January 2006
- Jonsson, Åsa M.; Hallquist, Mattias; Ljungström, Evert
- Environmental Science & Technology, Vol. 40, Issue 1
Formation of highly oxygenated organic molecules from aromatic compounds
journal, January 2018
- Molteni, Ugo; Bianchi, Federico; Klein, Felix
- Atmospheric Chemistry and Physics, Vol. 18, Issue 3
Dependence of nucleation rates on sulfuric acid vapor concentration in diverse atmospheric locations
journal, January 2008
- Kuang, C.; McMurry, P. H.; McCormick, A. V.
- Journal of Geophysical Research, Vol. 113, Issue D10
First long-term study of particle number size distributions and new particle formation events of regional aerosol in the North China Plain
journal, January 2011
- Shen, X. J.; Sun, J. Y.; Zhang, Y. M.
- Atmospheric Chemistry and Physics, Vol. 11, Issue 4
New particle formation: Nucleation rates and spatial scales in the clean marine coastal environment
journal, May 1998
- O'Dowd, Colin D.; Geever, Michael; Hill, Martin K.
- Geophysical Research Letters, Vol. 25, Issue 10
Laboratory studies of particle nucleation: Initial results for H 2 SO 4 , H 2 O, and NH 3 vapors
journal, October 1999
- Ball, S. M.; Hanson, D. R.; Eisele, F. L.
- Journal of Geophysical Research: Atmospheres, Vol. 104, Issue D19
Measurement of the gas phase concentration of H 2 SO 4 and methane sulfonic acid and estimates of H 2 SO 4 production and loss in the atmosphere
journal, May 1993
- Eisele, F. L.; Tanner, D. J.
- Journal of Geophysical Research: Atmospheres, Vol. 98, Issue D5
The role of low-volatility organic compounds in initial particle growth in the atmosphere
journal, May 2016
- Tröstl, Jasmin; Chuang, Wayne K.; Gordon, Hamish
- Nature, Vol. 533, Issue 7604
Gas-phase tropospheric chemistry of biogenic volatile organic compounds: a review
journal, January 2003
- Atkinson, Roger; Arey, Janet
- Atmospheric Environment, Vol. 37
Parametrization of ternary nucleation rates for H 2 SO 4 -NH 3 -H 2 O vapors
journal, January 2002
- Napari, I.
- Journal of Geophysical Research, Vol. 107, Issue D19
Gas-Phase Tropospheric Chemistry of Volatile Organic Compounds: 1. Alkanes and Alkenes
journal, March 1997
- Atkinson, R.
- Journal of Physical and Chemical Reference Data, Vol. 26, Issue 2
New particle formation and growth from methanesulfonic acid, trimethylamine and water
journal, January 2015
- Chen, Haihan; Ezell, Michael J.; Arquero, Kristine D.
- Physical Chemistry Chemical Physics, Vol. 17, Issue 20
Rapid Autoxidation Forms Highly Oxidized RO 2 Radicals in the Atmosphere
journal, October 2014
- Jokinen, Tuija; Sipilä, Mikko; Richters, Stefanie
- Angewandte Chemie International Edition, Vol. 53, Issue 52
Long-term analysis of clear-sky new particle formation events and nonevents in Hyytiälä
journal, January 2017
- Dada, Lubna; Paasonen, Pauli; Nieminen, Tuomo
- Atmospheric Chemistry and Physics, Vol. 17, Issue 10
Neutral molecular cluster formation of sulfuric acid–dimethylamine observed in real time under atmospheric conditions
journal, October 2014
- Kürten, Andreas; Jokinen, Tuija; Simon, Mario
- Proceedings of the National Academy of Sciences, Vol. 111, Issue 42
Effects of Chemical Complexity on the Autoxidation Mechanisms of Endocyclic Alkene Ozonolysis Products: From Methylcyclohexenes toward Understanding α-Pinene
journal, November 2014
- Rissanen, Matti P.; Kurtén, Theo; Sipilä, Mikko
- The Journal of Physical Chemistry A, Vol. 119, Issue 19
Effects of amines on formation of sub-3 nm particles and their subsequent growth: MULTICOMPONENT NUCLEATION WITH AMINES
journal, January 2012
- Yu, Huan; McGraw, Robert; Lee, Shan-Hu
- Geophysical Research Letters, Vol. 39, Issue 2
Molecular understanding of atmospheric particle formation from sulfuric acid and large oxidized organic molecules
journal, October 2013
- Schobesberger, S.; Junninen, H.; Bianchi, F.
- Proceedings of the National Academy of Sciences, Vol. 110, Issue 43
Particle nucleation following the O 3 and OH initiated oxidation of α -pinene and β -pinene between 278 and 320 K : NUCLEATION AFTER MONOTERPENE OXIDATION
journal, May 2007
- Burkholder, James B.; Baynard, Tahllee; Ravishankara, A. R.
- Journal of Geophysical Research: Atmospheres, Vol. 112, Issue D10
A two-dimensional volatility basis set – Part 2: Diagnostics of organic-aerosol evolution
journal, January 2012
- Donahue, N. M.; Kroll, J. H.; Pandis, S. N.
- Atmospheric Chemistry and Physics, Vol. 12, Issue 2
Hydroxyl radical-induced formation of highly oxidized organic compounds
journal, December 2016
- Berndt, Torsten; Richters, Stefanie; Jokinen, Tuija
- Nature Communications, Vol. 7, Issue 1
Effect of ions on sulfuric acid-water binary particle formation: 2. Experimental data and comparison with QC-normalized classical nucleation theory: BINARY PARTICLE FORMATION EXPERIMENTS
journal, February 2016
- Duplissy, J.; Merikanto, J.; Franchin, A.
- Journal of Geophysical Research: Atmospheres, Vol. 121, Issue 4
The gas-phase ozonolysis of unsaturated volatile organic compounds in the troposphere
journal, January 2008
- Johnson, David; Marston, George
- Chemical Society Reviews, Vol. 37, Issue 4
Formation and growth rates of ultrafine atmospheric particles: a review of observations
journal, March 2004
- Kulmala, M.; Vehkamäki, H.; Petäjä, T.
- Journal of Aerosol Science, Vol. 35, Issue 2
Effect of ions on sulfuric acid-water binary particle formation: 1. Theory for kinetic- and nucleation-type particle formation and atmospheric implications: BINARY PARTICLE FORMATION THEORY
journal, February 2016
- Merikanto, Joonas; Duplissy, Jonathan; Määttänen, Anni
- Journal of Geophysical Research: Atmospheres, Vol. 121, Issue 4
Can Highly Oxidized Organics Contribute to Atmospheric New Particle Formation?
journal, November 2015
- Ortega, Ismael K.; Donahue, Neil M.; Kurtén, Theo
- The Journal of Physical Chemistry A, Vol. 120, Issue 9
Field induced ion evaporation from liquid surfaces at atmospheric pressure
journal, December 1979
- Thomson, B. A.; Iribarne, J. V.
- The Journal of Chemical Physics, Vol. 71, Issue 11
Aerosol surface area concentration: a governing factor in new particle formation in Beijing
journal, January 2017
- Cai, Runlong; Yang, Dongsen; Fu, Yueyun
- Atmospheric Chemistry and Physics, Vol. 17, Issue 20
Global atmospheric particle formation from CERN CLOUD measurements
journal, October 2016
- Dunne, E. M.; Gordon, H.; Kurten, A.
- Science, Vol. 354, Issue 6316
Molecular corridors and parameterizations of volatility in the chemical evolution of organic aerosols
journal, January 2016
- Li, Ying; Pöschl, Ulrich; Shiraiwa, Manabu
- Atmospheric Chemistry and Physics, Vol. 16, Issue 5
Measurements of new particle formation and ultrafine particle growth rates at a clean continental site
journal, February 1997
- Weber, R. J.; Marti, J. J.; McMurry, P. H.
- Journal of Geophysical Research: Atmospheres, Vol. 102, Issue D4
Iodine oxide homogeneous nucleation: An explanation for coastal new particle production
journal, May 2001
- Hoffmann, Thorsten; O'Dowd, Colin D.; Seinfeld, John H.
- Geophysical Research Letters, Vol. 28, Issue 10
A high-resolution mass spectrometer to measure atmospheric ion composition
journal, January 2010
- Junninen, H.; Ehn, M.; Petäjä, T.
- Atmospheric Measurement Techniques, Vol. 3, Issue 4
On the formation, growth and composition of nucleation mode particles
journal, September 2001
- Kulmala, M.; Maso, M. Dal; MÄKelÄ, J. M.
- Tellus B, Vol. 53, Issue 4
Nucleation events in the continental boundary layer: Influence of physical and meteorological parameters
journal, January 2002
- Boy, M.; Kulmala, M.
- Atmospheric Chemistry and Physics, Vol. 2, Issue 1
Gas phase formation of extremely oxidized pinene reaction products in chamber and ambient air
journal, January 2012
- Ehn, M.; Kleist, E.; Junninen, H.
- Atmospheric Chemistry and Physics, Vol. 12, Issue 11
Modeling the Charging of Highly Oxidized Cyclohexene Ozonolysis Products Using Nitrate-Based Chemical Ionization
journal, May 2015
- Hyttinen, Noora; Kupiainen-Määttä, Oona; Rissanen, Matti P.
- The Journal of Physical Chemistry A, Vol. 119, Issue 24
Observation of new particle formation and measurement of sulfuric acid,
ammonia, amines and highly oxidized organic molecules at a rural site in
central Germany
journal, January 2016
- Kürten, Andreas; Bergen, Anton; Heinritzi, Martin
- Atmospheric Chemistry and Physics, Vol. 16, Issue 19
Effect of Relative Humidity on the Chemical Composition of Secondary Organic Aerosol Formed from Reactions of 1-Tetradecene and O 3
journal, June 2000
- Tobias, Herbert J.; Docherty, Kenneth S.; Beving, Derek E.
- Environmental Science & Technology, Vol. 34, Issue 11
A large source of low-volatility secondary organic aerosol
journal, February 2014
- Ehn, Mikael; Thornton, Joel A.; Kleist, Einhard
- Nature, Vol. 506, Issue 7489
α-Pinene Autoxidation Products May Not Have Extremely Low Saturation Vapor Pressures Despite High O:C Ratios
journal, April 2016
- Kurtén, Theo; Tiusanen, Kirsi; Roldin, Pontus
- The Journal of Physical Chemistry A, Vol. 120, Issue 16
Autoxidation of Organic Compounds in the Atmosphere
journal, September 2013
- Crounse, John D.; Nielsen, Lasse B.; Jørgensen, Solvejg
- The Journal of Physical Chemistry Letters, Vol. 4, Issue 20
Kinetics of the Gas-Phase Reactions of Alcohols, Aldehydes, Carboxylic Acids, and Water with the C13 Stabilized Criegee Intermediate Formed from Ozonolysis of 1-Tetradecene
journal, June 2001
- Tobias, Herbert J.; Ziemann, Paul J.
- The Journal of Physical Chemistry A, Vol. 105, Issue 25
Formation of OH radicals in the gas phase reactions of O 3 with a series of terpenes
journal, January 1992
- Atkinson, Roger; Aschmann, Sara M.; Arey, Janet
- Journal of Geophysical Research, Vol. 97, Issue D5
Air pollution control and decreasing new particle formation lead to strong climate warming
journal, January 2012
- Makkonen, R.; Asmi, A.; Kerminen, V. -M.
- Atmospheric Chemistry and Physics, Vol. 12, Issue 3
Theoretical constraints on pure vapor-pressure driven condensation of organics to ultrafine particles: ORGANIC CONDENSATION
journal, August 2011
- Donahue, N. M.; Trump, E. R.; Pierce, J. R.
- Geophysical Research Letters, Vol. 38, Issue 16
Ambient Pressure Proton Transfer Mass Spectrometry: Detection of Amines and Ammonia
journal, October 2011
- Hanson, D. R.; McMurry, P. H.; Jiang, J.
- Environmental Science & Technology, Vol. 45, Issue 20
Thermodynamics and kinetics of atmospheric aerosol particle formation and growth
journal, January 2012
- Vehkamäki, Hanna; Riipinen, Ilona
- Chemical Society Reviews, Vol. 41, Issue 15
New Particle Formation in the Remote Troposphere: A Comparison of Observations at Various Sites
journal, February 1999
- Weber, R. J.; McMurry, P. H.; Mauldin, R. L.
- Geophysical Research Letters, Vol. 26, Issue 3
The role of relative humidity in continental new particle formation
journal, January 2011
- Hamed, Amar; Korhonen, Hannele; Sihto, Sanna-Liisa
- Journal of Geophysical Research, Vol. 116, Issue D3
Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms
journal, January 2006
- Sihto, S. -L.; Kulmala, M.; Kerminen, V. -M.
- Atmospheric Chemistry and Physics, Vol. 6, Issue 12
OH radical formation from the gas-phase reactions of O3 with a series of terpenes
journal, September 2002
- Aschmann, Sara M.; Arey, Janet; Atkinson, Roger
- Atmospheric Environment, Vol. 36, Issue 27
Chemical ionization mass spectrometric measurements of atmospheric neutral clusters using the cluster-CIMS
journal, January 2010
- Zhao, Jun; Eisele, Fred L.; Titcombe, Mari
- Journal of Geophysical Research, Vol. 115, Issue D8
Influence of OH Scavenger on the Water Effect on Secondary Organic Aerosol Formation from Ozonolysis of Limonene, Δ 3 -Carene, and α-Pinene
journal, August 2008
- Jonsson, Åsa M.; Hallquist, Mattias; Ljungström, Evert
- Environmental Science & Technology, Vol. 42, Issue 16
SOA formation from the photooxidation of α -pinene: systematic exploration of the simulation of chamber data
journal, January 2016
- McVay, Renee C.; Zhang, Xuan; Aumont, Bernard
- Atmospheric Chemistry and Physics, Vol. 16, Issue 5
Hydrogen-Bonding Interaction in Molecular Complexes and Clusters of Aerosol Nucleation Precursors
journal, January 2009
- Zhao, Jun; Khalizov, Alexei; Zhang, Renyi
- The Journal of Physical Chemistry A, Vol. 113, Issue 4
Calibration of a Chemical Ionization Mass Spectrometer for the Measurement of Gaseous Sulfuric Acid
journal, February 2012
- Kürten, Andreas; Rondo, Linda; Ehrhart, Sebastian
- The Journal of Physical Chemistry A, Vol. 116, Issue 24
An Iodide-Adduct High-Resolution Time-of-Flight Chemical-Ionization Mass Spectrometer: Application to Atmospheric Inorganic and Organic Compounds
journal, May 2014
- Lee, Ben H.; Lopez-Hilfiker, Felipe D.; Mohr, Claudia
- Environmental Science & Technology, Vol. 48, Issue 11
Influence of temperature on the molecular composition of ions and charged clusters during pure biogenic nucleation
journal, January 2018
- Frege, Carla; Ortega, Ismael K.; Rissanen, Matti P.
- Atmospheric Chemistry and Physics, Vol. 18, Issue 1
Atmospheric sulphuric acid and neutral cluster measurements using CI-APi-TOF
journal, January 2012
- Jokinen, T.; Sipilä, M.; Junninen, H.
- Atmospheric Chemistry and Physics, Vol. 12, Issue 9